scholarly journals 101 A numerical simulation of distribution change of sea ice crystal orientation with development of the crystal

2006 ◽  
Vol 2006.45 (0) ◽  
pp. 1-2
Keyword(s):  
Numerical Simulation ◽  
Sea Ice ◽  
Crystal Orientation ◽  
Ice Crystal ◽  
Distribution Change

scholarly journals Medium Scale Test and Numerical Simulation on Ice Impact to a Structure due to Tsunami during Sea Ice Season

2008 ◽  
Vol 55 ◽  
pp. 851-855 ◽  
Author(s):  
Shinji KIOKA ◽  
Masaya MORI ◽  
Yasuji YAMAMOTO ◽  
Takahiro TAKEUCHI
Keyword(s):  
Numerical Simulation ◽  
Sea Ice ◽  
Medium Scale ◽  
Scale Test

scholarly journals Bounds on the complex permittivity of polycrystalline materials by analytic continuation

2015 ◽  
Vol 471 (2174) ◽  
pp. 20140702 ◽  
Author(s):  
A. Gully ◽  
J. Lin ◽  
E. Cherkaev ◽  
K. M. Golden
Keyword(s):  
Sea Ice ◽  
Single Crystal ◽  
Analytic Continuation ◽  
Complex Permittivity ◽  
Crystal Orientation ◽  
Fluid Transport ◽  
Continuation Method ◽  
Growth Conditions ◽  
Polycrystalline Materials ◽  
Remote Sensing Techniques

An analytic continuation method for obtaining rigorous bounds on the effective complex permittivity ε * of polycrystalline composite materials is developed. It is assumed that the composite consists of many identical anisotropic crystals, each with a unique orientation. The key step in obtaining the bounds involves deriving an integral representation for ε *, which separates parameter information from geometrical information. Forward bounds are then found using knowledge of the single crystal permittivity tensor and mean crystal orientation. Inverse bounds are also developed, which recover information about the mean crystal orientation from ε *. We apply the polycrystalline bounds to sea ice, a critical component of the climate system. Different ice types, which result from different growth conditions, have different crystal orientation and size statistics. These characteristics significantly influence the fluid transport properties of sea ice, which control many geophysical and biogeochemical processes important to the climate and polar ecosystems. Using a two-scale homogenization scheme, where the single crystal tensor is numerically computed, forward bounds for sea ice are obtained and are in excellent agreement with columnar sea ice data. Furthermore, the inverse bounds are also applied to sea ice, helping to lay the groundwork for determining ice type using remote sensing techniques.

scholarly journals The detectability of sea-ice leads in satellite data as a function of atmospheric conditions and measurement scale

1993 ◽  
Vol 17 ◽  
pp. 227-232 ◽  
Author(s):  
J. Key ◽  
R. Stone ◽  
J. Maslanik ◽  
E. Ellefsen
Keyword(s):  
Sea Ice ◽  
Brightness Temperature ◽  
Satellite Data ◽  
The Arctic ◽  
Transfer Model ◽  
Atmospheric Effects ◽  
Ice Crystal ◽  
Model Calculations ◽  
Ice Leads ◽  
The Impact

The release of heat from sea-ice leads is an important component of the heat budget in the Arctic, but the impact of leads on regional scale climate is difficult to assess without information on their distribution in both space and time. Remote sensing of leads using satellite data, specifically AVHRR thermal and Landsat visible imagery, is examined with respect to one lead parameter: lead width. Atmospheric effects are illustrated through the concept of thermal contrast transmittance, where the brightness temperature contrast between leads of various ice thicknesses and the surrounding multi-year ice is simulated using a radiative transfer model. Calculations are made as a function of aerosol, ice crystal precipitation, and cirrus cloud optical depths. For example, at ice crystal optical depths of more than about 1.5 under mean January conditions in the central Arctic, the brightness temperature differences between 2 m and 5 cm thick ice are similar to the ice temperature variability so that there would be insufficient contrast to distinguish a lead from the surrounding ice. The geometrical aspects of the sensor are also simulated by degrading Landsat data so that the effect of sensor field-of-view on retrieved lead width statistics can be assessed. Large leads tend to “grow” with increased pixel size while small leads disappear. Changes in lead width and orientation distributions can readily be seen.

402 Investigation on influence of surface roughness of cooling surface on ice structure formed by control of initial ice crystal orientation

2014 ◽  
Vol 2014.24 (0) ◽  
pp. 121-122
Author(s):  
Takahiro IKEYA ◽  
Koji MATSUMOTO ◽  
Yoshikazu TERAOKA ◽  
Kazuyoshi MATSUNAGA ◽  
Masato HONDA
Keyword(s):  
Surface Roughness ◽  
Crystal Orientation ◽  
Ice Crystal ◽  
Cooling Surface

A Numerical Simulation of Sea Ice Cover in Hudson Bay

1994 ◽  
Vol 24 (12) ◽  
pp. 2515-2533 ◽  
Author(s):  
Jia Wang ◽  
L. A. Mysak ◽  
R. G. Ingram
Keyword(s):  
Numerical Simulation ◽  
Sea Ice ◽  
Ice Cover ◽  
Hudson Bay

Crystal Orientation Rotation of Ice During Growth in a Bended Capillary

2011 ◽  
Author(s):  
Yoshikazu Teraoka ◽  
Ryo Fukuno ◽  
Koji Matsumoto
Keyword(s):  
Empirical Model ◽  
Crystal Orientation ◽  
High Rate ◽  
Control Technique ◽  
Ice Crystal ◽  
Ice Growth ◽  
Before And After ◽  
Supercooling Temperature

A control technique of crystal orientation of ice can presumably help to improve freezing processes of various industries. However, the technique without seed ice has not been established yet. The author had found that crystal orientation of ice rotated gradually during high-rate growth along a cooling wall. The purpose of this paper is to examine the crystal orientation rotation of ice during growth in several types of bended capillaries at supercooling temperature. We show that, after growing through the capillaries, c-axis of ice crystal is within a certain angle range. On the basis of the measurement the rotation of crystal orientation before and after the growth through some sections of the capillaries, we constructed an empirical model of c-axis rotating gradually during ice growth in the capillary. The calculation of the model can explain the approach process of c-axis of ice crystal growing in the bended capillary to the specified direction.

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